C056D

DTC C056D

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provide an overview of each diagnostic category.

DTC Descriptor
DTC C056D 39
- ECU Hardware Performance Internal Electronic Failure

Circuit/System Description

The power steering control module (PSCM) continuously monitors the internal circuitry within the module.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The PSCM detects an internal malfunction within the module.

Action Taken When the DTC Sets

* Active Steering is disabled.
* SERVICE STEERING SYS and/or STABILITY SECURE MODE is displayed on the DIC.

Conditions for Clearing the DTC

* A current DTC will clear on the next malfunction free ignition cycle.
* A history DTC will clear after 100 consecutive malfunction free ignition cycles.

Reference Information
Schematic Reference

Power Steering Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Active Front Steering Description and Operation (Active Front Steering Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the PSCM.
2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal 1 and ground.

• If greater than specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Ignition OFF, reconnect the X2 harness connector. Disconnect the X3 harness connector at the PSCM.
5. Ignition OFF, test for less than 5 ohms between the ground circuit terminal 3 and ground.

• If greater than specified value, test the ground circuit for an open/high resistance.

6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

7. Test for B+ on the control circuit terminal 10.

• I less than specified value, test the control circuit for an short to ground or an open/high resistance.

8. Ignition OFF, reconnect the X3 harness connector. Disconnect the X1 harness connector at the PSCM.
9. Test for less than 5 ohms between the signal circuit terminal 7 and the signal circuit terminal 8.

• If greater than specified value, test both signal circuits for an open/high resistance. If the circuits test normal, test or replace the upper intermediate steering shaft.

10. Test for less than 5 ohms between the signal circuit terminal 7 and the signal circuit terminal 14.

• If greater than specified value, test both signal circuits for an open/high resistance. If the circuits test normal, test or replace the upper intermediate steering shaft.

11. Test for less than 5 ohms between the signal circuit terminal 8 and the signal circuit terminal 14.

• If greater than specified value, test both signal circuits for an open/high resistance. If the circuits test normal, test or replace the upper intermediate steering shaft.

12. If all circuits test normal, replace the PSCM. If the DTC resets, replace the upper intermediate steering shaft.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning)for PSCM replacement, setup, and programming